[Vikesrock]

So you want it to run one way the whole time when the button is being held and the other way the whole time the button is not held?

If that's what you want try the "Select" node. It's in the Comparisons palette I believe, and it will select the top input and pass it through if the middle input is true and the bottom input if the middle input is false. You would put the button as the middle input and your desired motor speeds as the top and bottom.

If you want to run the motor in a certain direction for a certain period of time on button press and release that becomes a little bit trickier.